I'm pretty sure the answer is A, am I correct?

Natural selection tends to

A) increase the frequency of characteristics that enhance survival and reproduction.
B) decrease the number of individuals in any given population.
C) lead to an increase in genetic drift.
D) decrease the likelihood of adaptation.

I agree.

To determine if your answer is correct, let's analyze each option and see which one aligns with the concept of natural selection.

A) increase the frequency of characteristics that enhance survival and reproduction.
This option aligns with the concept of natural selection. It states that traits that increase an organism's chances of survival and reproduction will become more prevalent in a population over time. These traits will be naturally selected for because individuals possessing them have a higher chance of passing them on to future generations. Therefore, option A is a plausible answer.

B) decrease the number of individuals in any given population.
Although natural selection can result in a decrease in population size in some cases, it is not the primary focus of natural selection. Natural selection primarily acts on the traits of individuals within a population, favoring those that increase their chances of survival and reproduction. Therefore, option B is less likely to be correct than option A.

C) lead to an increase in genetic drift.
Genetic drift is a random process that occurs due to chance events, such as natural disasters or the migration of a small group of individuals to a new location. It is not directly related to the process of natural selection. Therefore, option C is less likely to be correct than option A.

D) decrease the likelihood of adaptation.
Natural selection is the main driving force behind adaptation. It acts on existing genetic variation within a population, favoring traits that increase an organism's chances of survival and reproduction. Over time, this leads to the accumulation of advantageous traits, resulting in adaptation to the environment. Therefore, option D is unlikely to be correct.

Based on this analysis, it is highly likely that your answer, option A, is correct.